Injury-ravaged 49ers add defensive back to roster

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The 49ers’ Jaquiski Tartt (29) intercepts the ball intended for the Carolina Panthers’ Kelvin Benjamin in a game on Sept. 10. Tartt is one of several 49ers who’ve been place on the injured reserve list. (Nhat V. Meyer/Bay Area News Group)

The 49ers bolstered their depleted secondary by signing defensive back Antone Exum Jr. to a one-year deal. To make room on the roster, the 49ers placed offensive lineman Garry Gilliam on the injured-reserve list.

Exum was a 2014 sixth-round draft choice by the Minnesota Vikings. The 6-0, 219-pounder out of Virginia Tech is an addition to a unit that has lost safeties Jimmie Ward and Jaquiski Tartt to broken arms. Both are on injured reserve.